JPS5977890A - Embroidering cloth press apparatus of sewing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a presser foot device for machine embroidery.

In manual machine embroidery, the fabric is stretched over a hoop for embroidery, and this is interposed between the needle plate and the embroidery presser foot attached to the lower end of the presser foot of the sewing machine.The feed dog is lowered to its inactive position, and the fabric is The sewing machine is operated by holding the cloth between the presser foot and the needle plate, and the embroidery hoop is moved freely by hand to silicify the embroidery pattern.

Therefore, in addition to the work of first positioning the hoop inside the hoop, the presser foot has to perform many hoop attachment and removal operations, such as thread breakage in the embroidery silicic acid, clogging of stitches, repositioning of the fabric relative to the hoop, and when embroidery is completed. For this reason, it is necessary for the hoop to go under the presser foot several times, but in order to make the hoop go under the presser foot, the presser foot attached to the lower end of the presser foot is lifted up, and the presser foot attached to its lower end is raised L, and there is a space between the presser foot and the throat plate. You need to make sure there is enough space for the hoop to pass through.

Conventionally used embroidery presser feet have the rear end of the presser foot swingably attached to a mounting frame fixed to a presser bar, and a spring that urges the presser foot downward and presses the fabric. When using a presser foot like this, the presser foot is constantly pushed downward by a spring, so when the presser foot is pulled up, the presser foot rotates further downwards due to the spring.
There is not enough space between the presser foot and the needle bar, and in order to increase the pressing force of the presser foot, the downward rotation angle is large. Some of them remain in contact with the fabric, and when attaching and detaching the hoop, the presser foot must be pulled up by hand each time, which is extremely inconvenient and causes a decrease in embroidery work efficiency.

Also, in order for the needle to pierce the fabric and form a complete stitch, the presser foot needs to press the fabric sufficiently, so the spring that presses down the presser foot must be strong enough. te2
I have to do it. However, if the presser foot is constantly pressing down the fabric with strong force, more force than necessary will be applied when moving the fabric after the needle has risen and pulled out of the fabric. There were 176 problems, such as preventing the smooth movement of cloth.

To solve this problem, there is a device in which a presser foot holds the cloth only while the needle is piercing the cloth, and when the needle comes out of the cloth, the presser foot also separates from the cloth.

However, in this case, the presser foot moves up and down in conjunction with the vertical movement of the needle bar, which obstructs the operator's eyes as the vertical movement of the presser foot enters the area around the needle tip, which hinders efficient embroidery work. It had become.

Moreover, 1. Since the i+ bar and presser foot are linked, the positional relationship of the needle tip to the fabric of the first needle is unknown when the needle is positioned upward, so lower the needle bar 'F' each time. There were inconveniences such as having to lower the needle tip onto the fabric.

This invention has been developed in view of the above-mentioned problems with the conventional presser foot device for sewing machine stitches.When the presser foot is lifted L, the presser foot automatically rotates upward six times in conjunction with the presser foot. This allows for a wider space between the presser foot and the needle plate than before, and the presser foot remains in contact with the fabric during the silicic acid process of the embroidery line, allowing the needle to pierce the fabric and complete the stitch. Until then, give the presser foot the desired pushing force, and until the needle tip passes through the fabric and enters the next stitch, reduce the spring pressure to an appropriate pressure so as not to interfere with the free and smooth movement of the fabric. The object of the present invention is to obtain a presser foot device as described above.

That is, in this invention, the upper end of the i=T frame is swingably attached to the rear upper part of the mounting frame which is detachably fixed to the lower end of the presser bar of the sewing machine, and the upper end of the movable frame is moved forward from the upper end of the movable frame. A stopper is provided at an appropriate place on the sewing machine arm, etc., so that the protruding arm is pressed down when the presser bar is raised to rotate the movable frame backward. A restoring spring is attached to the movable frame, and the rear end of the presser foot for sewing machine embroidery and the rear end of the operating member are attached to the bottom door of this movable frame so that they can swing vertically. A presser foot spring is installed between the actuating members, with one end urging the actuating member upward and the other end urging the presser foot downward, and between the presser foot and the movable frame, the presser foot is attached to the movable frame. A spring that biases upward is installed, and a receiving part is provided in the front part of the operating member to increase the pressing force of the presser foot spring by being pushed by a part of the needle when the needle oscillates downward. A part of the frame is provided with a spring holder that pushes up a part of the presser foot spring when the presser foot is raised and rotates the presser foot upwards, allowing the presser foot to be lowered and the cloth to be pressed down by the presser foot for machine embroidery. When the needle pierces the fabric in silicic acid, the pressing force of the presser foot spring becomes stronger at peak 1, where the needle pierces the fabric, and the needle rises and comes out of the fabric. When the presser foot is raised, the presser foot rotates upward to provide a presser foot force surface L for machine embroidery, which allows sufficient space between the presser foot and the cloth.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the presser foot device of the present invention will be explained below based on an embodiment shown in the accompanying drawings.

In the figure, reference numeral 1 denotes a sewing machine arm, and attached to this arm (r-1°) are a needle bar 2, which is driven downward by a known drive mechanism (yellow), and a presser bar 3, which is raised or lowered by a known lever operation.

4 is the mounting frame, remove the normal presser foot at the lower end of presser bar 3,
After that, the presser foot is fixed using screws 5 for attaching the entire presser foot. The upper end of the movable frame 6 is attached to the upper rear side of the mounting frame 4 so as to be swingable in the front and rear directions about an axis 7.

Reference numeral 8 denotes an arm projecting forward from the upper end of the movable frame 6, and a stopper 9 that comes into contact with this arm 8 serves to keep the arm 1 in a proper position. Further, a restoring spring 1o is installed between the mounting frame 4 and the movable frame 6, which biases the movable frame 6 forward, that is, in the direction of clockwise rotation of the movable frame 6 in one direction.

Reference numeral 11 denotes a presser foot for machine embroidery, and its rear end is swingably attached to the lower part of the movable frame 6 via a shaft 12. The 1'+i1 part of this presser foot 11 is bent downward as shown in 4; This is referred to as a presser part 13.

Reference numeral 14 denotes an actuating member, whose rear end is swingably attached to the lower end of the movable frame 6 by the shaft 12, and between the movable frame 6 and the actuating member 14, the actuating member 14 is biased upward and a cloth presser is attached. A presser spring 15 that urges downward is attached, and a receiving portion 17 is attached to the front of the actuating member 14 to be pressed down by a pressing portion 16 provided on a portion of the needle bar 2 that has descended. : A bent piece 27 is provided on the lower side of the arm 8 of the movable frame 6.

IS is a spring receiving portion provided in a part of the mounting frame 4, and this spring receiving portion 18 is located below the lower side a of the presser foot spring 15, and when the presser foot 11 moves back, the lower side a or the spring receiving portion Part 1
8.

Reference numeral 19 denotes a spring attached to the part @12, which acts to rotate the presser foot 11 upwardly relative to the movable frame 6 by 1υ1.

Part 1. In the figure, 20 is a sewing machine needle fixed to the hole of the needle bar 2, 21 is a needle plate fixed to the sewing machine bed (not shown), 22 is a needle hole provided in the needle plate 21, and 23 is an inner frame. A hoop is made up of a hoop 24 and an outer frame 26, and 26 is a cloth stretched over the hoop 23 and sandwiched between the inner frame 24 and the outer frame 25.

The cloth presser device of the present invention has the above-mentioned configuration, and in FIGS. 1 and 2, the cloth presser part 13 is inserted into the hoop 23 on which the cloth 26 is stretched, and the cloth presser part 13 and the throat plate 21 are used to hold the cloth 2δ. In this state, while operating the sewing machine, the hoop 23 is supported by hand to perform machine embroidery.

When using the above silicic acid, presser bar 3 is F! ? , l are pushed down by springs (not shown), and the movable frame 6 is in the lower position. Further, when the presser foot 11 is in a state where the sewing machine needle 2o is raised as shown in FIGS. The hoop 23 can be moved freely together with the seat 26, although the opening cloth presser spring 15 exerts almost no pressing force on the cloth.

Next, the needle bar 2 is lowered, and the pushing part 16 is moved to the operating member 14.
When the receiving part 17 is pushed, the actuating member 14 rotates downward,
The spring 15 is compressed and the pressing force of the presser foot 13 is increased,
With the fabric 26 fixed on the throat plate 21, the sewing machine N2Q pierces the fabric 26, creates a stitch, and when the needle 20 passes through the fabric 26 and rises, the okitoya 16 also releases the push button of the actuating member 14 and cuts the fabric 26. ,
26 to make it easier to move.

Furthermore, when the operation of the sewing machine is stopped and the presser bar 3 is pulled up against a spring (not shown) by operating a lever (not shown), the arm B of the movable frame 6, which is lowered together with the presser bar 3, becomes a stopper! ], but since the movable frame 6 rises further, the movable frame (3
rotates backward as shown in FIG. 3, and pulls the presser foot 11 backward. Therefore, the lower side a of the spring 15 on the side of the presser foot 11 is pushed up by the spring receiver 18 of the mounting frame 4, and the presser foot 11 is rotated upward as shown in FIG. The space between the presser part 13 and the throat plate 21 is sufficiently opened so that the hoop 23 can be easily attached and detached.

In this invention, as described above, the presser foot 11 is rotated in -Th'F in conjunction with the vertical movement of the presser foot bar 3.
Since the presser foot 43 can be raised to the raised position, it is easy to attach and detach the presser foot 7-123.Furthermore, the pressing force of the spring 15 that presses the presser foot 11 against the cloth 26 moves in conjunction with the needle bar 2. @ When the needle 20 pierces the fabric 26 by increasing or decreasing it with the member 14, the fabric 26 is strongly pressed and fixed onto the throat plate 21, so a good stitch can be obtained, and when the needle 20 comes out of the fabric 26, the fabric presser Since the pressing force of the cloth 11 is weakened and the cloth 26 can be easily moved, excellent embroidery patterns can be created very easily.

[Brief explanation of drawings]

FIG. 1 is a partially longitudinal front view showing one embodiment of the presser foot device of the present invention. FIGS. 1, 2, and 3 are partially longitudinal side views showing each state of the above, and FIG. 4 is a transverse plane. Figures 45 and 45 are exploded perspective views of essential parts. 1... Sewing machine arm, 3... Presser bar, 4... Boning frame, 6... Movable frame, 8... Arm, 9... Stopper,
DESCRIPTION OF SYMBOLS 10... Restoration spring, 11... Cloth presser foot, 14... Operating member, 15... Cloth presser spring, 16... Pressing part, 1
γ... Receiving part, IF-3... Spring receiving part, 19... Spring. Patent applicant Maruzen Sewing Machine Co., Ltd. Agent Kama 1) Mata 2

Claims (1)

[Claims] The upper end of the movable frame is attached to the upper rear side of the mounting frame, which is removably fixed to the lower end of the presser foot of the sewing machine, so that it can swing freely in the front and back direction.
A stopper is provided at an appropriate place on the sewing machine arm, etc., to push down the bowl that protrudes forward from the upper end of the movable frame when the presser bar is raised, and rotate the movable frame backward. A restoring spring is installed to bias the movable frame downward, and the rear end of the presser foot for use on the sewing machine and the rear end of the actuating member are attached to the lower end of the movable frame so that they can swing vertically. , A presser foot spring is installed between the presser foot and the workpiece I rib member, which biases the actuating member upward at one end and pressurizes the presser foot downward at the other end.
A spring is attached to the front part of the actuating member that biases the presser foot upward with respect to the movable frame. A presser foot for sewing machine embroidery is provided with a receiving part that increases the force, and a spring receiving part is provided in a part of the mounting frame to push up a part of the presser foot spring and rotate the presser foot upward when the presser foot is raised. device 0